ContactsRequest.Insert(feedUri, newEntry) sometimes fails with System.Net.ProtocolViolationException

问题

I have this piece of code for adding a contact in a test gmail account I created:

public class SomeClass
{
    private const string ClientId = "someclientid"
    private const string CliendSecret = "muchsecretwow";

    private const string ApplicationName = "such app";
    private const string RedirectUri = "http://localhost";

    private const string Scopes = "https://www.google.com/m8/feeds/";
    private OAuth2Parameters _parameters;

    private string _accessToken, _refreshToken;
    public void GoogleApiCallAddContact() {
        GetOAuthParameters();
        if (!GetTokensFromMemory())
            throw new Exception("please create new authorization code");
        _parameters.AccessToken = _accessToken;
        _parameters.RefreshToken = _refreshToken;

        var settings = new RequestSettings(ApplicationName, _parameters);


        var cr = new ContactsRequest(settings);

        var newEntry = new Contact {
            Name = new Name {
                FullName = "John Foo",
                GivenName = "John",
                FamilyName = "Foo",
            },
            Content = "some info"
        };

        newEntry.Emails.Add(new EMail {
            Primary = true,
            Rel = ContactsRelationships.IsOther,
            Address = "foo@somemailserver.com"
        });


        var feedUri = new Uri("https://www.google.com/m8/feeds/contacts/default/full");


        cr.Insert(feedUri, newEntry);



    }

    private void GetOAuthParameters() {
        _parameters = new OAuth2Parameters {
            ClientId = ClientId,
            ClientSecret = CliendSecret,
            RedirectUri = RedirectUri,
            Scope = Scopes,
        };
    }

    private bool GetTokensFromMemory() {
        if (File.Exists("./tokens.txt")) {
            var lines = File.ReadLines("./tokens.txt").ToList();
            _accessToken = lines[0];
            _refreshToken = lines[1];
            return true;
        }
        _accessToken = _refreshToken = null;
        return false;
    }
}

Sometimes(and sometimes not,maybe depending on non-deterministic parameters) I get this exception:

System.Net.ProtocolViolationException : When performing a write operation with AllowWriteStreamBuffering set to false, you must either set ContentLength to a non-negative number or set SendChunked to true.
   at System.Net.HttpWebRequest.CheckProtocol(Boolean onRequestStream)
   at System.Net.HttpWebRequest.GetResponse()
   at Google.GData.Client.GDataRequest.Execute()
   at Google.GData.Client.GDataGAuthRequest.Execute(Int32 retryCounter)
   at Google.GData.Client.GOAuth2Request.Execute()
   at Google.GData.Client.Service.EntrySend(Uri feedUri, AtomBase baseEntry, GDataRequestType type, AsyncSendData data)
   at Google.GData.Client.Service.Insert(Uri feedUri, AtomEntry newEntry, AsyncSendData data)
   at Google.GData.Client.Service.Insert(Uri feedUri, TEntry entry)
   at Google.GData.Client.FeedRequest`1.Insert(Uri address, Y entry)
   at SomeDirectory.Tests.SomeClass.GoogleApiCallAddContact() in GmailApiLearningTests.cs: line 124

Which seems to be out of my code's scope, since it's deep within gdata's implementation. It's also strange that when I get this exception on adding a contact, an other test that uses a ContactRequest to get all contacts works just fine. Any insights on this?

Update: To anyone having the same issue do this:

try{
   cr.Insert(feedUri,newEntry);
}
catch(System.Net.ProtocolViolationException)
{
   cr.Insert(feedUri,newEntry);
}

The problem is that the first insert fails(because of the invalid access token), the client lib calls OAuthUtil.RefreshAccessToken(parameters) but somehow fails to re-issue the insert with the new token or at least fail with a GDataRequestException->WebException for unauthorized. So by doing the above, you get your tokens refreshed and manually re-issue the insert call.

回答1:

I had the same error and the problem was that the token had expired. You can confirm that using fiddler. I had a 401 error. Once I refreshed the token, everything worked fine. Hope that help.

来源：https://stackoverflow.com/questions/23804960/contactsrequest-insertfeeduri-newentry-sometimes-fails-with-system-net-protoc

标签

gdata

google-contacts-api